Speed by CAN from dash

[gtihk]

Hi guys,
I have four wheel speed sensors connected to a SDL3 and the speeds are sent via CAN to a M142.
In M1 tune, could someone advise as how I should work out the scaling for speeds received via CAN please?
I have tyre circumference 1.773m. Thanks!

[Stephen Dean]

Hi,

Use a scale of 1566.711 and a Sensor Teeth count of 100, the dash should be transmitting the wheel speeds with a resolution of 0.1km/h.

[gtihk]

If the wheel circumference is changed. How do I calculate the new scaling required, or is it not necessary because it has been accounted for in the dash?
Could you explain how the value of 1566.711 is actually calculated please?

[Stephen Dean]

In an excel spreadsheet, the formula is as follows.

Base Resolution (Dash)/(Base Resolution (Dash) * 10 * Wheel Circumference (m) (M1) * 3.6/1000) * Sample Teeth (M1)

So, for your case it is 0.1/(0.1*10*1.773*3.6/1000)*100 = 1566.711